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Finding the Fourth Proportional to 640,870.20, 961,305.30 and 167,603.40

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Solution

The fourth proportional to 640,870.20, 961,305.30 and 167,603.40 is: 251,405.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,870.20 : 961,305.30 = 167,603.40 : x
  2. Step 2: Convert to fraction form
    640,870.20/961,305.30 = 167,603.40/x
  3. Step 3: Cross multiply
    640,870.20x = 961,305.30 × 167,603.40
  4. Step 4: Simplify right side
    640,870.20x = 161,118,036,718.02
  5. Step 5: Solve for x
    x = 161,118,036,718.02/640,870.20
  6. Step 6: Final answer
    x = 251,405.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.